... the Fed has found itself forced to experiment. The immense stimulus campaign that it started in response to the 2008 financial crisis changed its relationship with the financial markets. It has pumped so many dollars into the system that it cannot easily drain enough money to discourage lending, its traditional approach. Instead, the Fed plans to throw more money at the problem, paying lenders not to make loans.

The Fed, embedded in the banking system, has also concluded that working through the banks is no longer sufficient to influence the broader economy. It plans to strengthen its hold by working directly with an expanded range of lenders.

...

To switch metaphors, the old monetary-policy machine sits at the bottom of a lake of excess reserves. The Fed would need to sell most of the securities it has accumulated before short-term rates would start to rise. Selling quickly could roil markets; selling slowly could allow the economy to overheat. So the Fed decided to find another way.

Instead of draining all that excess money, the Fed decided to freeze it.

...

The straightforward part of the plan is persuading banks not to make loans. In a serendipitous stroke, Congress passed a law shortly before the financial crisis that let the Fed pay interest on the reserves that banks kept at the Fed. Written as a sop to the banking industry, it has become the new linchpin of monetary policy.

Say the Fed wanted to raise short-term interest rates to 1 percent, meaning that it did not want banks to lend at lower rates. Because the glut of reserves is so great, the Fed could not easily raise rates by reducing the availability of money. Instead, the Fed plans to pre-empt the market, paying banks 1 percent interest on reserves in their Fed accounts, so banks have little reason to lend at lower rates. "Why would you lend to anyone else when you can lend to the Fed?" Kevin Logan, chief United States economist at HSBC, asked rhetorically.

This is not a cheap trick. Since the crisis, the Fed has paid banks a token annual rate of 0.25 percent on reserves. Last year alone, that cost $6.7 billion that the Fed would have otherwise handed over to the Treasury. Paying 1 percent interest would cost four times as much. The Fed has sent roughly $500 billion to the Treasury since 2008. As the Fed raises rates, some projections show that it may not transfer a single dollar in some years. Instead, the Fed will pay banks tens of billions of dollars not to use the trillions it paid them previously.

...

The rest of the financial system is also awash in cash, and lenders -- like money market mutual funds -- put downward pressure on interest rates as they fight to attract borrowers...

The Fed lacks the legal authority to pay these lenders a minimum interest rate on deposits, as it does to the banks. But two years ago, Lorie Logan, one of Mr. Potter's top aides, suggested the Fed could achieve the same goal by borrowing from these companies at a minimum interest rate.

The resulting deals, known as overnight reverse repurchase agreements, signal a significant break from the Fed's history of working through only the banking industry.

...

When liftoff arrives, however, the Fed plans to place this machinery inside the familiar language of the old system. It is likely to announce that it is raising the federal funds rate, the interest rate that banks pay to borrow reserves, from its current range of 0 to 0.25 percent to a new range of 0.25 to 0.5 percent. The Fed does not plan to emphasize that this rate is now a stage prop or that the real work of raising rates will be done outside the limelight by its new tools.

If at first your model doesn't work, just add epicycles to epicycles (and nevermind if you are breaking the law)...